x*x*0.2*34=235
    x^3-35x^2-275x+375
    x*x*0.2*35=235
    x*x*0.5*35=235
    2x=3
    （0.7+x）/2*4.5*30=180
    （0.7+x）/2*4.5*30
    0.7*x*30=1.05
    -2.5y=3/2
    2m=3
    1/6x=-1
    x/2-2x=3-1
    （0.8+X）/2*1.5*30=55.5
    x/2-2x=3-1
    x^3-35x^2-275x+375
    2200000×(－178.9)=(－13.8)×300×x×(0.5x－40)＋(x/555－0.82)×(－3.4483)×330×360×(555－40)
    2200000×(－178.9)=(－13.8)×300×x×(0.5x－40)＋(x/555－0.82)×(－3.4483)×330×360×(555－40)
    1+6a+5a*a+3*a*a*a+a*a*a*a=3467401739
    6a+3=5
    （2000-50n）/2.5√n=1.65

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